feat: add rl_assets.dspy — standard API to list assets by vendor_group_id

Standard external API returning {status, data} format.
Requires vendor_group_id param, enforces org_id isolation via get_userorgid().

wwwroot/api/rl_assets.dspy

@@ -0,0 +1,23 @@
+
+vendor_group_id = params_kw.get('vendor_group_id', '')
+
+if not vendor_group_id:
+    return json.dumps({"status": "error", "data": {"message": "vendor_group_id 不能为空"}}, ensure_ascii=False)
+
+org_id = (await get_userorgid()) or '0'
+
+result = await rl_list_assets_client(org_id, vendor_group_id)
+
+if result.get('success'):
+    return json.dumps({
+        "status": "ok",
+        "data": {
+            "assets": result.get('assets', []),
+            "total": len(result.get('assets', []))
+        }
+    }, ensure_ascii=False)
+else:
+    return json.dumps({
+        "status": "error",
+        "data": {"message": result.get('message', '查询失败')}
+    }, ensure_ascii=False)